My Passat 08 registration has some electrical problems. The heating, the fans and the seat heats are not working at all and the windscrean jetwash not working too. I have checked the fuses and the numbers 38, 39, 40, 41, 41 on the driver side are not working and the number 38 on the pasanger side is not working.

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If the fuse isn't blown, it may be a broken heating element or a disconnected harness. Look under the seat and take a look at the wire harnesses - are they all plugged in? Jiggle or push on them a bit (do NOT do this to any yellow connectors under there though - yellow connectors are for airbags and the static electricity in your body can blow them). If they're all OK, and that doesn't work, and no wires are broken in the connectors, you may have a damaged heater. Has anyone ever knelt on the seat to reach across and get something? That kind of excess pressure can easily damage the heating element.

There should be a connector under each seat which connects power to the heating element. It is likely either clipped to the seat or tucked under the carpeting. You'll almost definitely need to remove the seat to get easier access to it, though it should be possible to find/access it without removing it, just more difficult. Once you find it, disconnect it. You can use any multimeter with a continuity tester to test the circuit. First, check the DC voltage coming from the wires that come up from the floorboard. If you are getting voltage there, you will want to check continuity of the element itself by probing the two wires with the meter set to it's continuity testing selection. If there are more than two wires you will need to determine which is the common wire and which are the "live" wires. With the power disconnected you can test the element to figure this out easily. For example if your heated seat has three wires, test all three for continuity in pairs. If one wire always shows continuity no matter which other wires on the same plug you touch that should be common.

If the element tests good (in other words you find that all the circuits show continuity) and you are getting power from the plug that comes from the vehicle itself, you might need to check the resistance of the element. It is rare to have a bad element that still shows continuity, but it is possible that the resistance may have for some reason become lowered and the element therefore does not heat up.

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See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they don't work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and messing up the seat module which controls the heaters too. My 05 Suburban had the same issue. Can check by unplugging sensor and see if heated seats work .

See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they don't work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and mesing up the seat module which controls the heaters too. My 05 Suburban had the same issue